Need help with a countdown timer.

[IgorChete 0]

Basically, i want to test if a certain command in my script has completed in certain amount of time.

Something like this:

Timer starts

Some commands

if the timer hasn't reached 30 seconds, reset timer.

I've read the Help file about _Timer_SetTimer, but i don't really understand how it works.

[PsaltyDS 30]

Keep it simple. Stick with TimerInit() and TimerDiff():

Global $iTimer

While 1
    $iTimer = TimerInit()

    ; Do stuff

    If TimerDiff($iTimer) > 10000 Then
        MsgBox(16, "Timeout", "That took longer than 10 seconds.")
        ExitLoop
    EndIf
WEnd

[IgorChete 0]

$iTimer = TimerInit() resets the timer to 0, right?

I've integrated your code into my script and now i wait for the IE to freeze at some point to see if it works properly.

[PsaltyDS 30]

$iTimer = TimerInit() resets the timer to 0, right?

No, it get the current value of an RT Clock. Then TimerDiff() will get you the difference between that saved value and the new current value of the RTC, which is approx the number of milliseconds elapsed. You can test that by displaying the value.